As long as the mind is enslaved, the body can never be free. Psychological freedom, a firm sense of self-esteem, is the most powerful weapon against the long night of physical slavery. – Martin Luther King Jr.

Reading is to the mind what exercise is to the body. – Joseph Addison

I would rather have a mind opened by wonder than one closed by belief. – Gerry Spence

The snake which cannot cast its skin has to die. As well the minds which are prevented from changing their opinions; they cease to be mind. – Friedrich Nietzsche

Anyone who stops learning is old, whether at twenty or eighty. Anyone who keeps learning stays young. The greatest thing in life is to keep your mind young. – Henry Ford

The teacher who is indeed wise does not bid you to enter the house of his wisdom but rather leads you to the threshold of your mind. – Khalil Gibran

As a single footstep will not make a path on the Earth, so a single thought will not make a pathway in the mind. To make a deep physical path, we walk again and again. To make a deep mental path, we must think over and over the kind of thoughts we wish to dominate our lives. – Henry David Thoreau

I will not let anyone walk through my mind with their dirty feet. – Mahatma Gandhi

The purpose of education is to replace an empty mind with an open one. – Malcolm Forbes

Your living is determined not so much by what life brings to you as by the attitude you bring to life; not so much by what happens to you as by the way your mind looks at what happens. – Khalil Gibran

Any idea, plan, or purpose may be placed in the mind through repetition of thought. – Napoleon Hill

If the mind, that rules the body, ever so far forgets itself as to trample on its slave, the slave is never generous enough to forgive the injury, but will rise and smite the oppressor. – Henry Wadsworth Longfellow

The test of a first-rate intelligence is the ability to hold two opposed ideas in mind at the same time and still retain the ability to function. – F. Scott Fitzgerald

Reading is to the mind what exercise is to the body. – Joseph Addison

Most people believe the mind to be a mirror, more or less accurately reflecting the world outside them, not realizing on the contrary that the mind is itself the principal element of creation. – Rabindranath Tagore